SagDIG in the mass-metallicity plane marked with a white triangle and white dots for the T_e corrected and uncorrected oxygen abundance, respectively. The dotted black and solid blue lines are the local Universe T_e−based MZR of Curti et al. (2020) and Andrews & Martini (2013). The black and solid red lines represent the low-mass end of the MZR from Lee et al. (2006) and Berg et al. (2012). The contours represent the respective galaxy sample of dIrr galaxies used to fit the low-mass end of the MZR marked with corresponding colours. The dashed red area indicates the respective scatter of σ = 0.15 dex of the Berg et al. (2012) low-mass end of the MZR.